Newer drivers limit resolution to 2560x1600

Hi! I’m finding that for the T4 and M60, the 435.21 driver works on resolutions greater than 2560x1600, but the driver versions after this point don’t work.

This is what I’m running:
nvidia-settings --assign CurrentMetaMode="nvidia-auto-select +0+0 {ViewPortIn=5120x3200}"

On the 435 driver, xrandr | head gives me this output:

Screen 0: minimum 8 x 8, current 5120 x 3200, maximum 2560 x 1600
DVI-D-0 connected primary 5120x3200+0+0 (normal left inverted right x axis y axis) 530mm x 300mm
   1280x960      60.00*+  85.00

But on more recent drivers, the resolution will never go above 2560x1600. In particular, it won’t go over 4096000 pixels. So a 2048x2048 resolution will work fine, but a 2049x2048 resolution will not.

I’m running a Virtual X screen in both of these cases.

Does anyone know why future drivers seem to have a limit? Thank you!